package cn.wolfcode.service.impl;

import cn.wolfcode.domain.Permission;
import cn.wolfcode.mapper.PermissionMapper;
import cn.wolfcode.qo.QueryObject;
import cn.wolfcode.service.IPermissionService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;

@Service
@Transactional//事务
public class PermissionServiceImpl implements IPermissionService {
    @Autowired
    private PermissionMapper permissionMapper;

    @Override
    public void delete(Long id) {
        permissionMapper.deleteByPrimaryKey(id);
    }

    @Override
    public void save(Permission permission) {
        permissionMapper.insert(permission);
    }

    @Override
    public Permission get(Long id) {
        return permissionMapper.selectByPrimaryKey(id);
    }

    @Override
    public List<Permission> listAll() {
        return permissionMapper.selectAll();
    }

    @Override
    public void update(Permission permission) {
        permissionMapper.updateByPrimaryKey(permission);
    }

    @Override
    public PageInfo<Permission> query(QueryObject qo) {
       /* //查询数量
        int count = permissionMapper.selectForCount(qo);
        if (count == 0) {
            PageResult<Permission> pageResult = new PageResult<>(qo.getCurrentPage(),
                    qo.getPageSize(), count, Collections.emptyList());
            return pageResult;
        }//Collections.emptyList(),返回一个空的集合

        //获取总页数
        int totalPage = count % qo.getPageSize() == 0 ?
                count / qo.getPageSize() : count / qo.getPageSize() + 1;
        //判断当前页是否大于总页数,如果是,把总页数作为当前页来查询分页结果集
        if (qo.getCurrentPage() > totalPage) {
            qo.setCurrentPage(totalPage);
        }

        //代表有数据
        List<Permission> permissions = permissionMapper.selectForList(qo);
        return new PageResult<>(qo.getCurrentPage(),
                qo.getPageSize(), count, permissions);*/

        //告诉插件要开始分页了,传入当前页,每页显示数据
        PageHelper.startPage(qo.getCurrentPage(),
                qo.getPageSize());
        List<Permission> permissions = permissionMapper.selectForList(qo);
        return new PageInfo<>(permissions);
}
    @Autowired
    private ApplicationContext ctx;

    @Override
    public void reload() {
        //需求:把每个控制器中的贴了权限注解的方法转化为权限数据,并插入到数据库
        //查询数据库中已有的权限表达式
        List<String> expressions = permissionMapper.selectAllExpression();
        //1.获取所有的控制器
        Map<String, Object> map = ctx.getBeansWithAnnotation(Controller.class);
        Collection<Object> controllers = map.values();
        //2.遍历获取每个控制器中的方法
        for (Object controller : controllers) {
            //如果controller是普通的controller类,它的父类就object,object的方法也没有贴注解,效果不影响,就是效率不高
            //判断是否cglib代理,如果不是就跳过
            if (!AopUtils.isCglibProxy(controller)){
                continue;
            }
            Class<?> clazz = controller.getClass().getSuperclass();//控制器的字节码对象(controller是代理对象,获取他的父类)
            //3.遍历获取到每个方法
            Method[] methods = clazz.getDeclaredMethods();
            for (Method method : methods) {
                //4.判断是否有贴注解(shiro提供的)'
                //代理对象中的方法上的注解不能被继承,所以获取不到注解
                RequiresPermissions annotation = method.getAnnotation(RequiresPermissions.class);
                if (annotation != null) {
                    //5.从注解中获取权限相关的数据,并封装为权限对象
                    //因为可以多个,是数组接收所有存在索引位置
                    String name = annotation.value()[1];
                    String expression = annotation.value()[0];

                    //判断在集合中不包含的权限表达式,就需要插入到数据库
                    if (!expressions.contains(expression)) {
                        //6.插入到数据库
                        Permission permission = new Permission();
                        permission.setName(name);
                        permission.setExpression(expression);
                        permissionMapper.insert(permission);
                    }
                }

            }
        }


    }

    @Override
    public List<String> selectExpressionByEmpId(Long id) {
        return permissionMapper.selectExpressionByEmpId(id);
    }
}
